I guess according to their website they will be sending it out the week of the 9th.
"Beginning the week of January 9, 2017, we will invite you to enroll in Alaska's award-winning Mileage Plan, enabling access to book award travel on Alaska Airlines and Alaska Global Partners network to over 900 worldwide destinations. Plus, you'll receive more detail on how you can convert your Elevate points to Alaska Mileage Plan miles at a rate of 1.3 Mileage Plan miles per Elevate point. And for elite-level Elevate members, Alaska Mileage Plan will automatically match your elite status!"